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Archived threads in /diy/ - Do It yourself - 366. page

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File: solar-panels.jpg?t=1416860323.jpg (485KB, 810x486px) Image search: [Google]
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Hey /diy/,
My school started a huge fund for projects that provide a "more sustainable campus". Anyone have any ideas for the types of projects I could write up for a grant?
34 posts and 5 images submitted.
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>>1073049
Solar road ways that light up at night.
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>>1073049
Solar Roadways
https://www.youtube.com/watch?v=GtkbioiQHmA

alternatively get some 500 F caps to stick in your ass.
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>>1073049
Just to be clear, are you asking for projects that will actually work, or effective covers for embezzling funds?

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What are some basic guitar effects circuits? solid state or tube welcome

>https://www.sparkfun.com/products/13124

in fact I've been looking for a tube amp circuit with few components, or any tube circuits so I can experiment with them
28 posts and 7 images submitted.
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Here you go anon.
Build this and play it and it will put hair on your balls in no time.
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>>1073022
Where do I learn how to read this shit
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>>1073240
Not that guy, but definitely picked up on his sarcasm.

>few components.

The point is that guitar effects circuits aren't simple, and require a lot of components, or else they sound like dogshit. This is especially true of solid state circuits, which are more susceptible to noise (even from themselves) than digital ones.

Also...FYI.. SS circuits require a SHIT TON of current... like... leathal doses... probably not something you want to fuck around with if you can't even read a schematic... but if you must it would be a good idea to buy a kit than go the homebrew route first try. They are all over the internets.

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I need to make a cone shape out of fabric, as in Figure A. The cone will be made from two panels as in Figure B. How do I figure the amount of curvature for the sides marked with red arrows in Figure B? Is there some sort of calculator site where I can input the dimensions and it would tell me how far in or out the minor axis would be from the major axis?
13 posts and 4 images submitted.
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I'll answer your question tomorrow, too busy today, it'll probably take a good 15 minutes for me to write out everything you need to know
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>>1072856
Is this a trick question? The answer is none. No curvature. The edges marked should be straight.
>>
Why are you so fucking lazy?

http://lmgtfy.com/?q=cone+calculator

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I have some (quite a lot actually) leftover pressure treated wood from a deck.
I can either give them away for free on CL
Or take them to the dump
Or try to build something
Because I frequent this thread a lot, naturally I'm inclined towards the last one.

HOWEVER

I foresee some problems.
If I build a picnic table, I KNOW it will be rarely used (wife wants something looking nice on the deck)
If I build a small house for my kids, it will be heavy AF and a month later (when they'll get bored) I'll either have to move it or take it apart
If I start building a shed, I KNOW I'll end up spending way more than it's justified by its use.
The only two ideas I have left are:
>get a cheap Harbor Freight trailer frame and use the wood to make a platform and sides
>build some benches along the railing (connect to/part of the deck) picture semi-related

Anyone made anything else beside kids houses and picnic tables out of pressure treated wood?
17 posts and 5 images submitted.
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>>1072841

Car port? bike shed?
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>>1072841
Make benches or planters that match the aesthetic of the porch. If you or the wife is unsure about them, trim out the bottom of the bench/planter and do not connect it to the deck. Shazam, removable accents.

Why can't you just return the wood?
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>>1072855
car port - can't; the access to the deck is ... "complicated"
bike shed - something to keep in mind

>>1072878
forgot to mention that the deck is on the north side of the house, on the west I have a forest (tall trees) plus it's covered by other trees - no sun whatsoever (good for wood longevity though)
I returned whatever was unused (sweet money), I have a lot of "end pieces"

basically, the question is not:
>what to do ON the porch?
but more like:
>what crazy stuff I can try with that wood (if I don't like it or I can't do it or it doesn't work then I don't feel bad for wasting money on materials)?

no matter what I'll end up doing, I'm sure most of the pleasure will be derived from making it not from using it

Is pic related a good option for an off-the-shelf temporary outdoor workshop?

It's $200 for a 10 x 20 canopy tent with a steel frame.

Would I have better luck putting something together with 2x4s and some plastic sheeting/plywood?

I'm just trying to protect my woodworking tools from the elements, at least until next year.
10 posts and 4 images submitted.
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>>1072713
It all comes down to how good the canvas material is. I've seen them start to come apart in under a year. I buddy of mine got an old surplus GP Medium army test for $500 and that thing has been out in the weather for almost 15 years without a problem. They are 16x32 feet. There are smaller ones out there.
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>>1072716
Seems like your buddy got a great deal for the GP Medium tent, can't seem to find them cheaper than $900 online.

The GP Small 17x17 is selling for about $500 which is still more than I'm willing to spend for a tent.

Thanks for your input, didn't know that some of these tents begin breaking down within a year.
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Seems like a really good way to get your shit stolen.

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How can I test these tubes without tube tester.

What kind of projects can i make with these, audio-light projects very welcome
9 posts and 1 images submitted.
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ECC83s are called 12AX7 in the states.
You could make a preamplifier with these.
AZ41 are rectification tubes.
If you have 4 of them you could use them as a rectifier for said amp, why you would want to is beyond me.

The rest of the tubes are either too mangled to use or too manhandled to read on that image.
Post manufacturers and part numbers and i might look them up.

Otherwise just wire them and make a night light.
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>>1072460
how to wire them to make night light?
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>>1072453
so far the tubes are
philips:
az41
ecc83
ecc81
telefunken:
stv 85/10 og3 * 2
ec92
pl81
telam:
el84
tungsram:
ef86
sylvania:
GD ahg 5726

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I 3D printed a V4 compressed air engine of my own design that runs on breath power (1" bore x a little over 1" stroke to give you a sense of scale). It runs fine but I've noticed I'm losing a lot of air to blow-by around the pistons into the crankcase area. Currently the crankcase is just open - imagine an engine without an oil pan. How can I reuse this air?

I tried rings but they just added way too much friction and the engine wouldn't run. I've thought about maybe adding an "oilpan" with a fitting that connects it to the intake air, so as to reuse it. But then the air pressure in the crankcase would be equal to that in the intake and the pistons wouldn't move.

Maybe I could use it to drive a turbocharger? I wouldn't think the air pressure would be enough to generate any appreciable pressure out of the impeller though. Blow on your hand as hard as you can. About half of that is what I feel blowing past the pistons at mid-RPM.

What if I made my piston tops concave? Would I at least get more efficiency with the same idea as a hemi head?
13 posts and 3 images submitted.
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Here's a simplified drawing of what I have. It's actually 4 cylinders in a V configuration with 180° crank angles, but you get the idea.
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What if I did something similar to a carburetor, minus the venturi?
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>>1072117
better tolerances, polished surfaces, maybe make the rings out of some other plastic with less friction.

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Thinking about buying a Universal De Luxe sewing machine (pic related) so I can sew together /k/ shit like battle belts and plate carriers. Does anyone know a acceptable price and wither it has the power to punch through several layers of cordura or ballistic nylon.
16 posts and 2 images submitted.
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>>1072090
Looks like my old sings.
Should work better than anything short of an industrial that are sold nowadays.
I live in a city of 2 million.
Went to the largest fabric store, brought my stingray hides.
None of their machines could pierce it.
Singer I bought off fleabay for $50 does it all day long without issues.
>>
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>>1072090
$50 is a good deal if it works.

Dont use thin ass needles. That machine has a decent motor and will snap a needle pretty quickly.
Thick needles and keep them sharp.
To sharpen the needles when they get dull--
soda bottle cap
fill with 00 or finer steel wool so it mushrooms over the top about an inch
stretch a piece of junk fabric over the top and glue in place.
Poke the needle in and our about 15-20 times.

Seriously. When sewing anything thicker than 2 layers of cotton, use a tick sharp needle. Google is your friend.
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>>1072090
I'd put my money on an old Singer over any older brand. That's a really basic machine and I wouldn't pay for than $50 for it in working condition. Maybe more if it has a nice cabinet. That said, Singers are cheap and better. Post your local Craig's List and I will look and see if there are any good ones in your area. What's your budget?

File: 76684678990.jpg (87KB, 873x487px) Image search: [Google]
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How practical is a dome-shaped house?

Especially in an area frequented by hurricanes.
34 posts and 6 images submitted.
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Living wise would suck for me 6'5" 250 lbs there would be so many places I couldn't go.
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>>1071884
That's not how they are.
Friend has one, hardest part is fitting furniture and cabinets against curved walls
>>
Awful for furniture

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Does anyone have any tips for hiding the wires from this mess?
7 posts and 3 images submitted.
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Velcro straps.
>>
You are not gonna be able to hide them. Not with that desk design. The best you can do is make it look neat as fuck by bundling them. Unplug everything, then rerun the wires based on location and bundle along the way. No other option with that exposure.
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>>1071776
Nice Blightsteel.

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I need a pet door to fit a door that slides into the wall, so no store-bought pet door will fit. Also all the store-bought ones are cheap plastic pieces of shit, but I digress. I have access to a machine shop so I just need to figure out a simple design.

The thing will be cut from sheet metal with a laser, then it can be formed on a press for the bends.

See pic: I make two of those, and when the red areas are bent in to 90 then stick both sides together (obviously one side will be turned) so that forms the inner tunnel. The only thing left is figuring out how to attach the swinging door. I guess a hinge of some kind, any hinge recommendations? The door will be made of the same metal. Also gotta chamfer the screw holes so I can have the screws in there all flush, but that can be figured out once I pick the screws I guess. Its an interior door so I don't need it to lock or anything.

I figure 7" for the opening, and 1.5" of material around it. Round off the corners to keep it pretty, and I can even have it powder coated. I dunno how it came out to 10 1/16th but I will fix that later.

What is the fuzzy stick-on material around the clear door part called and where can I buy some?
https://www.amazon.com/dp/B01GHRKUTU

Thoughts?
24 posts and 3 images submitted.
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It's weatherstrip. You can buy some self adhesive stuff on amazon for pretty cheap.

For the hinge, just drill holes in the bent areas of one before you bend it, then just use a rod as a hinge.
>>
That pair of magnets on the one you linked seems like a good idea as well.
>>
Maybe offset the screw holes so you don't have screws meeting each other from both sides? Depends on door thickness and whatnot.

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Clay general?
As far as I know, you can just moisten clay and work with it right? I made this furnace cover, but the clay keeps cracking when it dries. Would there be any way to prevent this?
Clay from dirt-http://www.practicalprimitive.com/skillofthemonth/processingclay.html
Cheap furnace/kiln-http://www.instructables.com/id/Dual-Fuel-Metal-Melting-Furnace/?ALLSTEPS
8 posts and 2 images submitted.
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>>1071520
its too thick to set right
>>
Needs sand don't remember the exact portions but it will prevent cracking during drying and when used on a funace also you need to dry something that thick very slowly
>>
Ceramics major here; what these other good folk have said are true.
-Need to allow clay to dry slowly and evenly
. Clay bodies shrink as they dry, anywhere from 10-15% and probably more for native/raw clay.
-excessive thickness will create uneven drying, leading to cracks.
-Adding a grog-like material (such as silica sand) will give strength/structure to the clay, which is helpful when hand-building or firing in an environment which can induce higher amounts of thermal shock/stressors (such as raku)

File: us bolt size.png (139KB, 782x631px) Image search: [Google]
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well played, google.
28 posts and 7 images submitted.
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Wrong board

But it's probably because you have uk English as your preferred language
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>>1071549
Oh shit, just noticed you weren't referring to the shitty units of measure
>>
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>>1071551
Ok fixed, again likely a localisation issue for you

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I found this knife when out for a walk. Is there a good way to get rid of the rust? This is only on the surface and the steel underneath looks fine. Can I get advice on the best cheap product to help remove rust and protect the blade? I have WD40, but what else is good for this? Thanks.
59 posts and 8 images submitted.
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Electrolysis.
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>>1071215
(Don't submerge the handle, only the blade.)
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>>1071204
So you picked up discarded murder evidence on purpose?

File: dock.png (7KB, 800x600px) Image search: [Google]
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Hey /diy/ thinking of building a dock. I have a lake in my backyard and the water levels have dropped pretty low this winter so I'm thinking now is my chance to build a dock.
I have the basic idea of what I want, I'm not going to worry about side rails yet.

My plan so far is:
>16'x8' base
>3 front supports 2'
>3 back supports 1'

The place I'm putting the supports in is about 2' below the water line and I'm going to dig a hole and fill it with concrete to put the support beam in, I feel I should get maybe a 3' or 4' support beam though.

pic related to give you all visual.
Any suggestions or things I should know about?
I have until maybe March at the latest to complete the dock so no rush.
7 posts and 1 images submitted.
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>>1071133
Every property around me has at least one pond.
One thing they have in common, rickity docks.
If you just want like 2-3 years, wood supports will work.
If you want something that will last, do solotubes and concrete.

They're just cardboard tubes of various diameters and lengths that you can buy at home improvement stores (only one use).
Buy 4'x9" tubes
Dig hole.
Stick bottom of tube in it.
Level all tops of tubes to same height.
Fill with concrete (add reinforcement if you can).
Drill concrete for brackets after it cures or put anchors in before it sets (I put anchors in first).
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>>1072240
*Sonotube
Sorry.
>>
/diy/ hates the water they are a land folk

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